炭素鋼のQ235A、B、304鋼材や耐火材料は、いくつ目の等級の材料に該当しますか？これは何を調べるの？
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炭素鋼のQ235A、B、304鋼材や耐火材料は、いくつ目の等級の材料に該当しますか？ 二級耐火材料ですか？これは何を調べるの？
耐火材料の分類は消防基準によるものでしょうか？もしそうなら、A級です
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